arch/x86/pci: use kasprintf

arch/x86/pci: use kasprintf

kasprintf combines kmalloc and sprintf, and takes care of the size
calculation itself.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression a,flag;
expression list args;
statement S;
@@

  a =
-  \(kmalloc\|kzalloc\)(...,flag)
+  kasprintf(flag,args)
  <... when != a
  if (a == NULL || ...) S
  ...>
- sprintf(a,args);
// </smpl>

Signed-off-by: Julia Lawall <[email protected]>
LKML-Reference: <201005241913[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>